In Washington State legal sale of marijuana began July 8, 2014. A voluntary, anonymous roadside study was conducted to assess the prevalence of drivers testing positive for alcohol and other drugs including marijuana on Washington’s roads. Data was collected in three waves, before implementation of legal sales, about 6 months after implementation, and one year after implementation. Of almost 2,500 participants, 14.6 percent of drivers, 19.4 percent of drivers, and 21.8 percent of drivers were THC-positive in Waves 1, 2, and 3, respectively.
Examination of the Legalization and Decriminalization of Marijuana on the DWI System: Highlights from the Expert Panel Meeting
In accordance with the MAP-21 Act, NHTSA and GHSA convened an expert panel to study recreational and/or medical marijuana laws and their effect on driving, including law enforcement, prosecutors, judges, probation, toxicologists, and highway safety officials. The panel identified changes to the DWI system following enactment of laws legalizing and/or decriminalizing marijuana for medical and/or recreational purposes; identified lessons learned; and found measures that should be used to evaluate these laws and their impact on traffic safety and the DWI system.
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